Geochronology and Petrogenesis of the Highly-Fractionated Early Cretaceous Narenwula Granite, Inner Mongolia, China

doi:10.19657/j.geoscience.1000-8527.2021.064

Abstract

Abstract:

A number of rare metal deposits have been discovered in Narenwula area of Inner Mongolia, with high metallogenic potential. However, there are still many controversies about the chronology and genesis of Narenwula granite. LA-ICP-MS zircon U-Pb dating and geochemical analysis have been carried out to determine the age and genetic type of the Narenwula granite. The U-Pb dating results show that the medium-coarse biotite monzogranite and porphyritic monzogranite were emplaced in the Early Cretaceous, at (142.1±1.0)Ma and(142.3±1.2)Ma, respectively. Its diagenetic age is basically consistent with the ages of the extensive regional granite emlacement in the Late Jurassic-Early Cretaceous period. Whole-rock geochemistry shows that the granite is characterized by high silica(SiO₂=73.69%-76.67%)and alkali(Na₂O+K₂O=8.40%-8.80%), but low P₂O₅, MgO, FeO^T, CaO, and REE. The rocks have high LREE/HREE ratios(LREE/HREE=6.23-14.28) and marked negative Eu anomalies (δEu=0.20-0.36). They are obviously enriched in Zr, Hf, Rb, and Th, but strongly depleted in Ba, Sr, P, and Ti, and slightly depleted in Nb. The granite is high-K calc-alkaline and weakly peraluminous. Based on the characteristics of mineralogy, petrology and geochemistry, we concluded that the granite belongs to highly-fractionated I-type. Considering the structural features and regional geological background, we inferred that the Narenwula granite in the northern margin of the North China Plate was formed in the Early Cretaceous within-plate extensional setting.

Key words: geochronology, geochemistry, highly-fractionated granite, Early Cretaceous, Inner Mongolia

CLC Number:

P588.1
P597

LI Zhu, ZHANG Dehui, ZHANG Rongzhen, SHEN Cunli, JIAO Shihao, LI Lin, ZHU Penglong. Geochronology and Petrogenesis of the Highly-Fractionated Early Cretaceous Narenwula Granite, Inner Mongolia, China[J]. Geoscience, 2022, 36(03): 848-861.

Figures/Tables 13

Fig.1 Geotectonic location map(a)and regional geologic map(b)of the Narenwula area (after reference [2])

Fig.2 Field and thin-section petrographic photos of the Narenwula granite

Table 1 LA-ICP-MS zircon U-Pb dating results of the granite sample NRWL-7 and NRWL-8

测点号	Th/10^-6	U/10^-6	$232 T h 238 U$		同位素比值								年龄/Ma
测点号	Th/10^-6	U/10^-6	$232 T h 238 U$		$207 P b 206 P b$ ±1σ		$207 P b 235 U$ ±1σ		$206 P b 238 U$ ±1σ				$207 P b 235 U$ ±1σ		$206 P b 238 U$ ±1σ		$207 P b 206 P b$ ±1σ
NRWL-7,中粗粒黑云母二长花岗岩
1	371.0	413.7	0.90		0.049 1±0.001 3		0.154 6±0.003 9		0.022 4±0.000 4		146.0±3.4				142.7±2.5		154.4±61.1
2	365.6	403.3	0.91		0.048 7±0.001 2		0.150 5±0.003 4		0.022 4±0.000 4		142.3±3.0				142.8±2.5		131.5±56.2
3	145.4	154.6	0.94		0.046 5±0.001 6		0.146 9±0.004 8		0.022 8±0.000 4		139.2±4.3				145.5±2.7		21.9±79.7
4	138.3	168.4	0.82		0.047 0±0.003 6		0.146 2±0.011 3		0.021 9±0.000 5		138.5±10.0				139.8±3.1		47.6±175.0
5	174.1	120.6	1.44		0.046 4±0.001 6		0.140 5±0.004 6		0.022 4±0.000 4		133.5±4.1				142.7±2.6		17.0±78.9
6	276.5	249.3	1.11		0.050 3±0.001 4		0.154 7±0.004 0		0.022 2±0.000 4		146.1±3.6				141.7±2.5		210.1±62.9
7	204.5	231.8	0.88		0.050 3±0.001 4		0.154 1±0.003 9		0.022 3±0.000 4		145.5±3.4				142.3±2.5		208.1±61.0
8	289.1	211.6	1.37		0.048 4±0.001 3		0.149 3±0.003 7		0.022 4±0.000 4		141.3±3.3				142.5±2.5		117.9±61.3
9	199.8	245.2	0.81		0.047 4±0.001 3		0.145 2±0.003 6		0.022 2±0.000 4		137.6±3.2				141.8±2.5		68.8±62.4
10	203.8	215.9	0.94		0.050 2±0.001 6		0.151 0±0.004 8		0.022 0±0.000 4		142.8±4.2				140.4±2.6		205.5±73.8
11	187.3	202.5	0.92		0.050 3±0.001 3		0.152 0±0.003 8		0.022 2±0.000 4		143.7±3.3				141.7±2.5		208.0±60.3
12	259.7	147.9	1.76		0.049 4±0.001 9		0.153 9±0.005 9		0.022 6±0.000 4		145.3±5.2				144.0±2.8		167.8±87.6
13	300.0	400.5	0.75		0.048 9±0.001 4		0.150 7±0.004 2		0.022 1±0.000 4		142.5±3.7				140.7±2.5		144.7±67.0
14	178.8	209.9	0.85		0.048 7±0.001 4		0.148 1±0.004 0		0.022 5±0.000 4		140.2±3.5				143.5±2.6		134.8±65.5
15	52.0	50.4	1.03		0.049 1±0.002 5		0.145 3±0.007 3		0.022 6±0.000 5		137.7±6.4				143.9±3.0		150.7±114.4
16	273.4	267.3	1.02		0.049 5±0.001 3		0.149 3±0.003 7		0.022 6±0.000 4		141.3±3.2				143.9±2.5		169.6±59.9
17	408.6	544.6	0.75		0.049 6±0.001 2		0.150 7±0.003 4		0.022 1±0.000 4		142.5±3.0				141.0±2.4		174.8±56.0
18	139.4	204.2	0.68		0.049 2±0.001 5		0.151 8±0.004 6		0.022 3±0.000 4		143.5±4.0				142.4±2.6		159.0±71.2
19	164.1	185.5	0.89		0.050 7±0.001 6		0.152 6±0.004 6		0.022 0±0.000 4		144.2±4.1				140.0±2.6		225.3±71.0
20	295.2	392.9	0.75		0.049 0±0.001 2		0.154 3±0.003 5		0.022 0±0.000 4		145.7±3.1				140.2±2.4		146.9±56.8
21	173.4	129.9	1.34		0.049 6±0.001 6		0.154 5±0.004 9		0.022 0±0.000 4		145.9±4.4				140.0±2.6		177.6±75.2
22	213.9	182.8	1.17		0.051 2±0.001 4		0.156 5±0.004 1		0.022 3±0.000 4		147.6±3.6				142.3±2.5		248.3±62.7
23	254.5	296.1	0.86		0.047 6±0.001 3		0.144 7±0.003 6		0.022 5±0.000 4		137.2±3.2				143.3±2.5		76.2±62.5
测点号	Th/10^-6	U/10^-6	$232 T h 238 U$	同位素比值								年龄/Ma
测点号	Th/10^-6	U/10^-6	$232 T h 238 U$	$207 P b 206 P b$ ±1σ		$207 P b 235 U$ ±1σ		$206 P b 238 U$ ±1σ				$207 P b 235 U$ ±1σ		$206 P b 238 U$ ±1σ		$207 P b 206 P b$ ±1σ
NRWL-8,似斑状二长花岗岩
1	255.4	281.4	0.91	0.050 2±0.001 3		0.152 4±0.003 7		0.022 1±0.000 4		144.0±3.2				140.9±2.4		204.6±58.9
2	324.1	456.3	0.71	0.049 4±0.001 3		0.149 8±0.003 6		0.022 4±0.000 4		141.7±3.2				143.0±2.5		168.4±59.5
3	208.2	248.7	0.84	0.049 8±0.001 4		0.152 1±0.003 9		0.022 0±0.000 4		143.7±3.4				140.6±2.5		184.4±62.2
4	158.3	227.3	0.70	0.047 7±0.001 4		0.150 4±0.004 0		0.022 2±0.000 4		142.3±3.6				141.8±2.5		82.7±66.8
5	154.9	133.6	1.16	0.049 6±0.001 9		0.144 1±0.005 3		0.021 9±0.000 4		136.7±4.7				139.4±2.7		176.0±85.5
6	279.6	424.1	0.66	0.051 1±0.001 4		0.151 0±0.003 7		0.022 7±0.000 4		142.8±3.3				144.5±2.5		243.3±60.1
7	91.1	84.4	1.08	0.049 8±0.002 0		0.149 2±0.006 0		0.022 0±0.000 4		141.2±5.3				140.5±2.7		185.0±92.5
8	161.8	170.6	0.95	0.047 7±0.002 2		0.156 0±0.007 1		0.022 3±0.000 5		147.1±6.2				142.2±2.8		83.5±104.9
9	124.3	124.1	1.00	0.048 4±0.001 6		0.151 0±0.004 8		0.022 7±0.000 4		142.8±4.2				144.9±2.6		118.4±75.3
10	96.9	83.2	1.16	0.048 1±0.002 6		0.149 9±0.008 2		0.022 6±0.000 5		141.8±7.2				144.1±3.2		101.9±124.0
11	488.1	595.9	0.82	0.049 3±0.001 1		0.152 2±0.003 1		0.022 5±0.000 4		143.9±2.7				143.6±2.4		163.9±51.8
12	223.6	259.4	0.86	0.047 8±0.001 3		0.145 7±0.003 6		0.022 2±0.000 4		138.1±3.2				141.3±2.5		87.7±62.0
13	184.0	115.1	1.60	0.049 8±0.002 0		0.150 2±0.005 8		0.021 8±0.000 4		142.1±5.1				139.1±2.7		186.3±89.0
14	294.2	270.6	1.09	0.047 3±0.001 2		0.148 5±0.003 6		0.022 7±0.000 4		140.5±3.2				144.5±2.5		61.6±61.8
15	399.2	809.0	0.49	0.047 3±0.001 2		0.161 0±0.003 9		0.023 1±0.000 4		151.6±3.4				147.3±2.5		64.7±61.1
16	366.8	423.7	0.87	0.050 7±0.001 3		0.156 0±0.003 8		0.022 5±0.000 4		147.2±3.3				143.3±2.5		227.3±59.0
17	381.2	237.6	1.60	0.048 2±0.001 4		0.149 0±0.004 2		0.021 8±0.000 4		141.0±3.7				139.0±2.5		110.2±68.3
18	577.8	842.8	0.69	0.049 1±0.001 1		0.154 1±0.003 1		0.022 1±0.000 4		145.5±2.7				141.0±2.4		150.7±51.2

Table 1 LA-ICP-MS zircon U-Pb dating results of the granite sample NRWL-7 and NRWL-8

测点号	Th/10^-6	U/10^-6	$232 T h 238 U$		同位素比值								年龄/Ma
测点号	Th/10^-6	U/10^-6	$232 T h 238 U$		$207 P b 206 P b$ ±1σ		$207 P b 235 U$ ±1σ		$206 P b 238 U$ ±1σ				$207 P b 235 U$ ±1σ		$206 P b 238 U$ ±1σ		$207 P b 206 P b$ ±1σ
NRWL-7,中粗粒黑云母二长花岗岩
1	371.0	413.7	0.90		0.049 1±0.001 3		0.154 6±0.003 9		0.022 4±0.000 4		146.0±3.4				142.7±2.5		154.4±61.1
2	365.6	403.3	0.91		0.048 7±0.001 2		0.150 5±0.003 4		0.022 4±0.000 4		142.3±3.0				142.8±2.5		131.5±56.2
3	145.4	154.6	0.94		0.046 5±0.001 6		0.146 9±0.004 8		0.022 8±0.000 4		139.2±4.3				145.5±2.7		21.9±79.7
4	138.3	168.4	0.82		0.047 0±0.003 6		0.146 2±0.011 3		0.021 9±0.000 5		138.5±10.0				139.8±3.1		47.6±175.0
5	174.1	120.6	1.44		0.046 4±0.001 6		0.140 5±0.004 6		0.022 4±0.000 4		133.5±4.1				142.7±2.6		17.0±78.9
6	276.5	249.3	1.11		0.050 3±0.001 4		0.154 7±0.004 0		0.022 2±0.000 4		146.1±3.6				141.7±2.5		210.1±62.9
7	204.5	231.8	0.88		0.050 3±0.001 4		0.154 1±0.003 9		0.022 3±0.000 4		145.5±3.4				142.3±2.5		208.1±61.0
8	289.1	211.6	1.37		0.048 4±0.001 3		0.149 3±0.003 7		0.022 4±0.000 4		141.3±3.3				142.5±2.5		117.9±61.3
9	199.8	245.2	0.81		0.047 4±0.001 3		0.145 2±0.003 6		0.022 2±0.000 4		137.6±3.2				141.8±2.5		68.8±62.4
10	203.8	215.9	0.94		0.050 2±0.001 6		0.151 0±0.004 8		0.022 0±0.000 4		142.8±4.2				140.4±2.6		205.5±73.8
11	187.3	202.5	0.92		0.050 3±0.001 3		0.152 0±0.003 8		0.022 2±0.000 4		143.7±3.3				141.7±2.5		208.0±60.3
12	259.7	147.9	1.76		0.049 4±0.001 9		0.153 9±0.005 9		0.022 6±0.000 4		145.3±5.2				144.0±2.8		167.8±87.6
13	300.0	400.5	0.75		0.048 9±0.001 4		0.150 7±0.004 2		0.022 1±0.000 4		142.5±3.7				140.7±2.5		144.7±67.0
14	178.8	209.9	0.85		0.048 7±0.001 4		0.148 1±0.004 0		0.022 5±0.000 4		140.2±3.5				143.5±2.6		134.8±65.5
15	52.0	50.4	1.03		0.049 1±0.002 5		0.145 3±0.007 3		0.022 6±0.000 5		137.7±6.4				143.9±3.0		150.7±114.4
16	273.4	267.3	1.02		0.049 5±0.001 3		0.149 3±0.003 7		0.022 6±0.000 4		141.3±3.2				143.9±2.5		169.6±59.9
17	408.6	544.6	0.75		0.049 6±0.001 2		0.150 7±0.003 4		0.022 1±0.000 4		142.5±3.0				141.0±2.4		174.8±56.0
18	139.4	204.2	0.68		0.049 2±0.001 5		0.151 8±0.004 6		0.022 3±0.000 4		143.5±4.0				142.4±2.6		159.0±71.2
19	164.1	185.5	0.89		0.050 7±0.001 6		0.152 6±0.004 6		0.022 0±0.000 4		144.2±4.1				140.0±2.6		225.3±71.0
20	295.2	392.9	0.75		0.049 0±0.001 2		0.154 3±0.003 5		0.022 0±0.000 4		145.7±3.1				140.2±2.4		146.9±56.8
21	173.4	129.9	1.34		0.049 6±0.001 6		0.154 5±0.004 9		0.022 0±0.000 4		145.9±4.4				140.0±2.6		177.6±75.2
22	213.9	182.8	1.17		0.051 2±0.001 4		0.156 5±0.004 1		0.022 3±0.000 4		147.6±3.6				142.3±2.5		248.3±62.7
23	254.5	296.1	0.86		0.047 6±0.001 3		0.144 7±0.003 6		0.022 5±0.000 4		137.2±3.2				143.3±2.5		76.2±62.5
测点号	Th/10^-6	U/10^-6	$232 T h 238 U$	同位素比值								年龄/Ma
测点号	Th/10^-6	U/10^-6	$232 T h 238 U$	$207 P b 206 P b$ ±1σ		$207 P b 235 U$ ±1σ		$206 P b 238 U$ ±1σ				$207 P b 235 U$ ±1σ		$206 P b 238 U$ ±1σ		$207 P b 206 P b$ ±1σ
NRWL-8,似斑状二长花岗岩
1	255.4	281.4	0.91	0.050 2±0.001 3		0.152 4±0.003 7		0.022 1±0.000 4		144.0±3.2				140.9±2.4		204.6±58.9
2	324.1	456.3	0.71	0.049 4±0.001 3		0.149 8±0.003 6		0.022 4±0.000 4		141.7±3.2				143.0±2.5		168.4±59.5
3	208.2	248.7	0.84	0.049 8±0.001 4		0.152 1±0.003 9		0.022 0±0.000 4		143.7±3.4				140.6±2.5		184.4±62.2
4	158.3	227.3	0.70	0.047 7±0.001 4		0.150 4±0.004 0		0.022 2±0.000 4		142.3±3.6				141.8±2.5		82.7±66.8
5	154.9	133.6	1.16	0.049 6±0.001 9		0.144 1±0.005 3		0.021 9±0.000 4		136.7±4.7				139.4±2.7		176.0±85.5
6	279.6	424.1	0.66	0.051 1±0.001 4		0.151 0±0.003 7		0.022 7±0.000 4		142.8±3.3				144.5±2.5		243.3±60.1
7	91.1	84.4	1.08	0.049 8±0.002 0		0.149 2±0.006 0		0.022 0±0.000 4		141.2±5.3				140.5±2.7		185.0±92.5
8	161.8	170.6	0.95	0.047 7±0.002 2		0.156 0±0.007 1		0.022 3±0.000 5		147.1±6.2				142.2±2.8		83.5±104.9
9	124.3	124.1	1.00	0.048 4±0.001 6		0.151 0±0.004 8		0.022 7±0.000 4		142.8±4.2				144.9±2.6		118.4±75.3
10	96.9	83.2	1.16	0.048 1±0.002 6		0.149 9±0.008 2		0.022 6±0.000 5		141.8±7.2				144.1±3.2		101.9±124.0
11	488.1	595.9	0.82	0.049 3±0.001 1		0.152 2±0.003 1		0.022 5±0.000 4		143.9±2.7				143.6±2.4		163.9±51.8
12	223.6	259.4	0.86	0.047 8±0.001 3		0.145 7±0.003 6		0.022 2±0.000 4		138.1±3.2				141.3±2.5		87.7±62.0
13	184.0	115.1	1.60	0.049 8±0.002 0		0.150 2±0.005 8		0.021 8±0.000 4		142.1±5.1				139.1±2.7		186.3±89.0
14	294.2	270.6	1.09	0.047 3±0.001 2		0.148 5±0.003 6		0.022 7±0.000 4		140.5±3.2				144.5±2.5		61.6±61.8
15	399.2	809.0	0.49	0.047 3±0.001 2		0.161 0±0.003 9		0.023 1±0.000 4		151.6±3.4				147.3±2.5		64.7±61.1
16	366.8	423.7	0.87	0.050 7±0.001 3		0.156 0±0.003 8		0.022 5±0.000 4		147.2±3.3				143.3±2.5		227.3±59.0
17	381.2	237.6	1.60	0.048 2±0.001 4		0.149 0±0.004 2		0.021 8±0.000 4		141.0±3.7				139.0±2.5		110.2±68.3
18	577.8	842.8	0.69	0.049 1±0.001 1		0.154 1±0.003 1		0.022 1±0.000 4		145.5±2.7				141.0±2.4		150.7±51.2

Fig.3 Cathodoluminesecence (CL) images and ages of zircons from the granite sample NRWL-7 (a) and NRWL-8 (b)

Fig.4 Zircon U-Pb ages and concordia diagrams of the granite sample NRWL-7(a) and NRWL-8(a)

Table 2 Analysis results of major(%), trace (10-6) and rare earth (10-6) elements of the Narenwula granite

样品号	岩性	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	FeO^T	MnO	MgO	CaO	Na₂O		K₂O	P₂O₅		烧失量		总量
NXWG-1	似斑状二长花岗岩	76.67	0.07	12.76	0.61	0.77	1.32	0.05	0.09	0.56	3.94		4.46	0.01		0.35		100.30
NXWG-2		75.60	0.09	13.37	0.67	0.59	1.19	0.04	0.09	0.37	3.91		4.84	0		10.49		100.03
NXWG-3		76.03	0.09	13.13	0.71	0.69	1.33	0.06	0.10	0.43	3.86		4.75	0		10.46		100.30
NXWG-4	中粗粒黑云母二长花岗岩	74.86	0.14	13.04	0.70	1.09	1.72	0.09	0.16	0.73	3.90		4.73	0		20.38		99.85
NXWG-5		73.69	0.26	13.29	0.99	1.48	2.37	0.10	0.26	0.94	4.08		4.44	0		20.50		100.06
NXWG-7		74.23	0.16	13.38	0.71	0.96	1.60	0.06	0.19	0.82	4.05		4.75	0.03		0.57		99.94
样品号	岩性	A/NK	A/CNK	T_Zr/℃	AR	DI	σ	Rb	Sr	Ba	Th		U	Nb		Ta		Zr
NXWG-1	似斑状二长花岗岩	1.127	1.035	741	3.90	93.65	2.10	386	40.2	95.8	34.9		12.50	25.8		3.3		89
NXWG-2		1.144	1.083	749	3.64	92.69	2.37	439	55.4	176.0	34.7		22.80	34.8		4.7		98
NXWG-3		1.141	1.070	759	3.64	94.33	2.25	416	54.9	177.5	37.1		11.40	41.4		5.9		111
NXWG-4	中粗粒黑云母二长花岗岩	1.129	1.014	778	3.61	92.98	2.34	374	74.2	216.0	43.0		20.00	35.7		3.2		139
NXWG-5		1.153	1.005	821	3.69	90.96	2.37	372	80.7	227.0	77.9		11.95	53.6		5.2		227
NXWG-7		1.132	1.006	799	3.66	92.77	2.48	362	89.4	315.0	46.0		18.55	40.5		3.9		186
样品号	岩性	Hf	Co	Ni	Cr	V	Sc	Li	Cs	Ga	Cu		Pb	Zn		Sb		W
NXWG-1	似斑状二长花岗岩	4.2	0.7	1.1	4	2	2.1	18.6	10.35	22.8	0.5		22.9	12		0.18		1.5
NXWG-2		4.6	0.7	1.0	3	3	2.5	23.5	11.65	23.6	0.4		23.0	12		0.16		3.0
NXWG-3		5.7	0.9	1.5	27	3	2.7	27.8	10.07	23.7	0.5		27.9	12		0.17		0.9
NXWG-4	中粗粒黑云母二长花岗岩	5.3	1.0	1.4	4	5	2.2	33.9	9.11	21.5	0.9		18.5	15		0.20		0.8
NXWG-5		8.4	1.4	1.2	4	9	3.7	53.6	15.80	23.8	0.4		19.5	19		0.15		0.9
NXWG-7		7.5	0.6	0.9	17	7	2.5	33.4	11.40	23.0	0.2		18.0	15		0.22		0.7
样品号	岩性	Sn	Bi	Mo	Cd	B	La	Ce	Pr	Nd	Sm		Eu	Gd		Tb		Dy
NXWG-1	似斑状二长花岗岩	2	0.03	0.30	0.02	7.00	20.8	42.2	4.46	14.1	2.74		0.26	2.27		0.38		2.11
NXWG-2		3	0.04	0.41	0.02	6.30	25.1	54.0	5.76	18.8	4.03		0.28	3.15		0.49		2.96
NXWG-3		3	0.05	0.41	0.04	6.14	23.7	48.3	5.07	18.2	4.05		0.33	3.62		0.60		3.66
NXWG-4	中粗粒黑云母二长花岗岩	3	0.03	0.74	0.02	6.76	33.2	62.8	6.56	20.8	3.79		0.4	2.87		0.46		2.79
NXWG-5		5	0.03	2.08	0.02	5.87	89.4	169.8	17.33	55.2	9.36		0.54	6.44		1.03		5.49
NXWG-7		3	0.03	1.38	0.02	6.83	43.2	85.0	8.88	27.9	4.89		0.48	3.66		0.62		3.75
样品号	岩性	Ho	Er	Tm	Yb	Lu	Y	REE	LREE	HREE		LREE/HREE			(La/Yb)_N		δEu
NXWG-1	似斑状二长花岗岩	0.49	1.64	0.29	2.25	0.43	16.4	94.42	84.56	9.86		8.58			6.63		0.31
NXWG-2		0.68	2.19	0.40	2.95	0.51	24.9	121.30	107.97	13.33		8.10			6.10		0.23
NXWG-3		0.84	2.64	0.46	3.54	0.64	27.5	115.65	99.65	16.00		6.23			4.80		0.26
NXWG-4	中粗粒黑云母二长花岗岩	0.60	1.84	0.33	2.52	0.41	19.3	139.37	127.55	11.82		10.79			9.45		0.36
NXWG-5		1.17	3.51	0.65	4.82	0.81	39.1	365.55	341.63	23.92		14.28			13.30		0.20
NXWG-7		0.78	2.38	0.43	3.29	0.55	25.3	185.81	170.35	15.46		11.02			9.42		0.33

Table 2 Analysis results of major(%), trace (10-6) and rare earth (10-6) elements of the Narenwula granite

样品号	岩性	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	FeO^T	MnO	MgO	CaO	Na₂O		K₂O	P₂O₅		烧失量		总量
NXWG-1	似斑状二长花岗岩	76.67	0.07	12.76	0.61	0.77	1.32	0.05	0.09	0.56	3.94		4.46	0.01		0.35		100.30
NXWG-2		75.60	0.09	13.37	0.67	0.59	1.19	0.04	0.09	0.37	3.91		4.84	0		10.49		100.03
NXWG-3		76.03	0.09	13.13	0.71	0.69	1.33	0.06	0.10	0.43	3.86		4.75	0		10.46		100.30
NXWG-4	中粗粒黑云母二长花岗岩	74.86	0.14	13.04	0.70	1.09	1.72	0.09	0.16	0.73	3.90		4.73	0		20.38		99.85
NXWG-5		73.69	0.26	13.29	0.99	1.48	2.37	0.10	0.26	0.94	4.08		4.44	0		20.50		100.06
NXWG-7		74.23	0.16	13.38	0.71	0.96	1.60	0.06	0.19	0.82	4.05		4.75	0.03		0.57		99.94
样品号	岩性	A/NK	A/CNK	T_Zr/℃	AR	DI	σ	Rb	Sr	Ba	Th		U	Nb		Ta		Zr
NXWG-1	似斑状二长花岗岩	1.127	1.035	741	3.90	93.65	2.10	386	40.2	95.8	34.9		12.50	25.8		3.3		89
NXWG-2		1.144	1.083	749	3.64	92.69	2.37	439	55.4	176.0	34.7		22.80	34.8		4.7		98
NXWG-3		1.141	1.070	759	3.64	94.33	2.25	416	54.9	177.5	37.1		11.40	41.4		5.9		111
NXWG-4	中粗粒黑云母二长花岗岩	1.129	1.014	778	3.61	92.98	2.34	374	74.2	216.0	43.0		20.00	35.7		3.2		139
NXWG-5		1.153	1.005	821	3.69	90.96	2.37	372	80.7	227.0	77.9		11.95	53.6		5.2		227
NXWG-7		1.132	1.006	799	3.66	92.77	2.48	362	89.4	315.0	46.0		18.55	40.5		3.9		186
样品号	岩性	Hf	Co	Ni	Cr	V	Sc	Li	Cs	Ga	Cu		Pb	Zn		Sb		W
NXWG-1	似斑状二长花岗岩	4.2	0.7	1.1	4	2	2.1	18.6	10.35	22.8	0.5		22.9	12		0.18		1.5
NXWG-2		4.6	0.7	1.0	3	3	2.5	23.5	11.65	23.6	0.4		23.0	12		0.16		3.0
NXWG-3		5.7	0.9	1.5	27	3	2.7	27.8	10.07	23.7	0.5		27.9	12		0.17		0.9
NXWG-4	中粗粒黑云母二长花岗岩	5.3	1.0	1.4	4	5	2.2	33.9	9.11	21.5	0.9		18.5	15		0.20		0.8
NXWG-5		8.4	1.4	1.2	4	9	3.7	53.6	15.80	23.8	0.4		19.5	19		0.15		0.9
NXWG-7		7.5	0.6	0.9	17	7	2.5	33.4	11.40	23.0	0.2		18.0	15		0.22		0.7
样品号	岩性	Sn	Bi	Mo	Cd	B	La	Ce	Pr	Nd	Sm		Eu	Gd		Tb		Dy
NXWG-1	似斑状二长花岗岩	2	0.03	0.30	0.02	7.00	20.8	42.2	4.46	14.1	2.74		0.26	2.27		0.38		2.11
NXWG-2		3	0.04	0.41	0.02	6.30	25.1	54.0	5.76	18.8	4.03		0.28	3.15		0.49		2.96
NXWG-3		3	0.05	0.41	0.04	6.14	23.7	48.3	5.07	18.2	4.05		0.33	3.62		0.60		3.66
NXWG-4	中粗粒黑云母二长花岗岩	3	0.03	0.74	0.02	6.76	33.2	62.8	6.56	20.8	3.79		0.4	2.87		0.46		2.79
NXWG-5		5	0.03	2.08	0.02	5.87	89.4	169.8	17.33	55.2	9.36		0.54	6.44		1.03		5.49
NXWG-7		3	0.03	1.38	0.02	6.83	43.2	85.0	8.88	27.9	4.89		0.48	3.66		0.62		3.75
样品号	岩性	Ho	Er	Tm	Yb	Lu	Y	REE	LREE	HREE		LREE/HREE			(La/Yb)_N		δEu
NXWG-1	似斑状二长花岗岩	0.49	1.64	0.29	2.25	0.43	16.4	94.42	84.56	9.86		8.58			6.63		0.31
NXWG-2		0.68	2.19	0.40	2.95	0.51	24.9	121.30	107.97	13.33		8.10			6.10		0.23
NXWG-3		0.84	2.64	0.46	3.54	0.64	27.5	115.65	99.65	16.00		6.23			4.80		0.26
NXWG-4	中粗粒黑云母二长花岗岩	0.60	1.84	0.33	2.52	0.41	19.3	139.37	127.55	11.82		10.79			9.45		0.36
NXWG-5		1.17	3.51	0.65	4.82	0.81	39.1	365.55	341.63	23.92		14.28			13.30		0.20
NXWG-7		0.78	2.38	0.43	3.29	0.55	25.3	185.81	170.35	15.46		11.02			9.42		0.33

Fig.5 Petrologic classification diagrams of SiO2 vs.(Na2O+K2O)(a), SiO2 vs. K2O(b), and A/CNK vs. A/NK(c) for the Narenwula granite (base maps after references [11⇓-13], cited data from references [2,14])

Fig.6 Chondrite-normalized REE patterns(a) and primitive mantle-normalized multi-element spidergram(b) of the Narenwula granite (normalizing values after reference [17])

Fig.7 Ages of Late Jurassic-Early Cretaceous granites and related tungsten-tin deposits in/around the study area (data from references [2,20⇓⇓⇓⇓⇓⇓-27])

Fig.8 Granite discrimination diagrams for the highly-fractionated Narenwula granite (base map after reference [29],[28],[35] and [36],respectively)

Fig.9 Harker diagrams for the Narenwula granite

Fig.10 Zircon εHf(t) vs. age plot for granites in the North China Plate and its adjacent regions (base map after reference [51] and data from references [49⇓⇓⇓-53])

Fig.11 Tectonic discrimination plots of R1-R2(a) and Ta-Yb (b) for the Narenwula granite (base maps after reference [59] and [60],respectively)

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